Bosch DSB5006 Daredevil Standard Spade Bit Set w/ Power Groove Hex Shank and Full Cone Threaded Tip (6 Piece Set) BIT SIZES INCLUDE: 3/8", 1/2", 5/8", 3/4", 7/8", and 1 in size. Bit length is 6 POWER GROOVE HEX SHANK: The hex shanks are reinforced to reduce the risk slipping in your drill / driver while in use SPUR AND REAMER TIPS: When youre drilling into a project, these bits provide 3 points of contact. This keeps a stronger grip on the wood for greater accuracy CONTOURED PADDLE: Keep chips from clogging up your bits. The curved design throws chips to the side, keeping your workspace cleared FULL CONE-THREADED TIP gives a smoother and faster cut than standard pointed tips